Studies on the Resistance of Apple to the Woolly Apple Aphid, Eriosoma lanigerum (Hausm.)

Abstract
Northern Spy and Early Harvest proved highly resistant, and Ben Davis, Wagener, Winesap, Mother, Stayman Winesap, King David, Northwestern Greening, Stark, Blacktwig, Jonathan, Lowry, Tolman, Grimes Golden, York Imperial, Virginia Beauty, Tetofski, Duchess of Oldenburg, and Baldwin susceptible. Methods used for the artificial infestation of the roots of apple trees are described. A classification of the infestation of aphids is given.

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